<template>
  <div>
    <!--面包屑导航区-->
    <el-breadcrumb separator-class="el-icon-arrow-right">
    <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
    <el-breadcrumb-item>权限管理</el-breadcrumb-item>
    <el-breadcrumb-item>角色列表</el-breadcrumb-item>
    </el-breadcrumb>
    <!--卡片视图-->
    <el-card>
        <el-row>
          <el-col>
              <el-button type="primary">添加角色</el-button>
          </el-col>
        </el-row>
        <!--角色列表区-->
        <el-table :data="rolelist" border stripe row-key="id">
          <!--展开列-->
          <el-table-column type="expand">
            <template slot-scope="scope">
              <el-row :class="['bdbottom',i1 === 0 ? 'bdtop' : '', 'vcenter']" v-for="(item1, i1) in scope.row.children" :key="item1.id">
                <!--一级权限-->
                <el-col :span="5">
                  <el-tag type="" closable @close="removeRightById(scope.row, item1.id)">{{item1.authName}}</el-tag>
                  <i class="el-icon-caret-right"></i>
                </el-col>
                <!--二级和三级权限-->
                <el-col :span="19">
                  <!--通过for循环嵌套渲染二级权限-->
                  <el-row :class="[i2 === 0 ? '' : 'bdtop', 'vcenter']" v-for="(item2, i2) in item1.children" :key="item2.id">
                    <el-col :span="6">
                      <el-tag type="success" closable @close="removeRightById(scope.row, item2.id)">{{item2.authName}}</el-tag>
                      <i class="el-icon-caret-right"></i>
                    </el-col>
                    <el-col :span="18">
                      <!--通过for循环渲染三级权限-->
                        <el-tag closable v-for="(item3) in item2.children" :key="item3.id"
                        type="warning" @close="removeRightById(scope.row, item3.id)">{{item3.authName}}</el-tag>
                    </el-col>
                  </el-row>
                </el-col>
              </el-row>
            </template>
          </el-table-column>
          <!--索引列-->
          <el-table-column label="#" type="index"></el-table-column>
          <el-table-column label="角色名称" prop="roleName"></el-table-column>
          <el-table-column label="角色描述" prop="roleDesc"></el-table-column>
          <el-table-column label="操作" width="300px">
            <template slot-scope="scope">
             <el-button type="primary" size="mini" icon="el-icon-edit">编辑</el-button>
             <el-button type="dinger" size="mini" icon="el-icon-delete">删除</el-button>
             <el-button type="warning" size="mini" icon="el-icon-setting" @click="showSetRightDialog(scope.row)">分配权限</el-button>
            </template>
          </el-table-column>
        </el-table>
    </el-card>
    <!--分配权限对话框-->
    <el-dialog title="分配权限" :visible.sync="setRightDialogVisible" width="50%">
      <!--树形控件-->
      <el-tree :data="rightslist" :props="treeProps" show-checkbox node-key="id"
      default-expand-all :default-checked-keys="defkeys" ref="treeRef">

      </el-tree>
      <span slot="footer" class="dialog-footer">
        <el-button @click="setRightDialogVisible = false">取消</el-button>
        <el-button type="primary" @click="allotRights">确定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      // 所有角色列表数据
      rolelist: [],
      // 分配权限对话框可见性
      setRightDialogVisible: false,
      // 树形权限列表
      rightslist: [],
      // 树形控件的属性绑定对象
      treeProps: {
        label: 'authName',
        children: 'children'
      },
      // 默认选中的id值数组
      defkeys: [],
      // 即将分配权限的角色id
      roleid: ''
    }
  },
  created() {
    this.getRolesList()
  },
  methods: {
    // 获取所有角色列表
    async getRolesList() {
      const { data: res } = await this.$http.get('roles')
      if (res.meta.status !== 200) {
        return this.$message.error('获取角色列表失败')
      }
      this.rolelist = res.data
    },
    // 根据id删除权限
    async removeRightById(role, rightId) {
      const confirmResult = await this.$confirm('此操作将永久删除权限，是否继续？', '提示', {
        cnfirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)
      if (confirmResult !== 'confirm') {
        return this.$message.info('已取消删除操作')
      }
      const { data: res } = await this.$http.delete(`roles/${role.id}/rights/${rightId}`)
      if (res.meta.status !== 200) {
        return this.$message.error('删除权限失败')
      }
      this.$message.success('删除成功')
      // this.getRoleList() 这样调用会导致表格重新渲染而关上
      role.children = res.data
    },
    async showSetRightDialog(role) {
      this.roleid = role.id
      // 获取所有权限的数据
      const { data: res } = await this.$http.get('rights/tree')
      if (res.meta.status !== 200) {
        return this.$message.error('获取权限列表失败')
      }
      this.rightslist = res.data
      // 需要先将数组清零
      this.defkeys = []
      this.getLeafKeys(role, this.defkeys)
      this.setRightDialogVisible = true
    },
    // 通过递归形式获取角色下所有三级权限的id并保存在数组中
    getLeafKeys(node, arr) {
      // 如果当前节点不包含children属性则是三级节点
      if (!node.children) {
        return arr.push(node.id)
      }
      node.children.forEach(element =>
        this.getLeafKeys(element, arr)
      )
    },
    // 为角色分配权限
    async allotRights() {
      // ...是展开运算符，用于解析数组
      const keys = [
        ...this.$refs.treeRef.getCheckedKeys(),
        ...this.$refs.treeRef.getHalfCheckedKeys()
      ]
      const idStr = keys.join(',')
      const { data: res } = await this.$http.post(`roles/${this.roleid}/rights`, { rids: idStr })
      if (res.meta.status !== 200) {
        return this.$message.error('分配权限失败')
      }
      this.$message.success('分配角色成功')
      this.getRolesList()
      this.setRightDialogVisible = false
    }
  }
}
</script>

<style lang="less" scope>
.el-tag{
  margin: 7px;
}
.bdtop{
  border-top: 1px solid #eee;
}
.bdbottom{
  border-bottom: 1px solid #eee;
}
.vcenter{
  display: flex;
  align-items: center;
}
</style>
